Malicious PDF — malware analysis report

Static analysis result for SHA-256 e708caa969d0d861…

MALICIOUS

PDF

82.4 KB Created: 2020-12-23 21:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98342811e3ecdbd467aeec6ba86e620e SHA-1: 6c7e5df456227b9f6ba483908511583216bd5a31 SHA-256: e708caa969d0d86125359fb5d20815bb60528c01e0f900f2034c88b045f225b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including one that appears to be a lure for downloading an application, and another pointing to a PDF file. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic suggest an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/strik?utm_term=font+emoji+keyboard+apk+download
    • https://cdn.sqhk.co/tigufarejeti/ifgcdji/sports_car_racing_usa.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f970a7fe1c60.pdf
    • https://cdn.sqhk.co/tadawatimi/ggTjfqe/pictoword_level_311_answer.pdf
    • https://cdn.sqhk.co/kefesizo/jjhdCM4/sygic_gps_navigation_maps_free_download.pdf
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/1299366.pdf
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f96700f48493.pdf
    • https://cdn.sqhk.co/wezopexa/gCTggif/sfg_2_3._9_mod_apk.pdf
    • https://cdn.sqhk.co/gopefovepagi/lgjkhfB/final_fantasy_viii_remastered_walkthrough_xbox_one.pdf
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f883e4f996e9.pdf
    • https://cdn.sqhk.co/fakupavod/NJJgjU7/damenit.pdf
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fa916f59903e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4865e4c-e666-4c83-8c21-f3bd565d147c/83901448870.pdf
    • https://uploads.strikinglycdn.com/files/4875db4f-48d4-4312-980f-224ae4456b4d/57219463857.pdf
    • https://uploads.strikinglycdn.com/files/5f41e610-0e77-40ba-9445-cc6f926343cf/38877700004.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ad.bin
0e0ae0d5f42c1943b1602d0d3774c9dc203b32c25b3534235228d9d246b49ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 2928 bytes
font_01_sfnt_off0000df29.bin
18a3107bcb8b71956dc72da50473bcb34aa0da00dc21efc6256819fd0c31e2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 5356 bytes
font_02_sfnt_off0000f159.bin
cd1bbe60a2fe17752ac494ee57533a5b175eb54220e218f27e61068ad08b1124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 2108 bytes
font_03_sfnt_off0000fb28.bin
e6317b178fc1964bbff83538a0f3781faf9acb055b2daefd454dca0f17393e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 11924 bytes
font_04_sfnt_off000123f9.bin
8f60358526a35ad92254f838ccb47bf5cf4bcae3515ef1b6efc4b53ceb98328c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 16936 bytes

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